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Taehee Yoo de492d4674 netdevsim: use __GFP_NOWARN to avoid memalloc warning commit `83cf4213ba` upstream. vfnum buffer size and binary_len buffer size is received by user-space. So, this buffer size could be too large. If so, kmalloc will internally print a warning message. This warning message is actually not necessary for the netdevsim module. So, this patch adds __GFP_NOWARN. Test commands: modprobe netdevsim echo 1 > /sys/bus/netdevsim/new_device echo 1000000000 > /sys/devices/netdevsim1/sriov_numvfs Splat looks like: [ 357.847266][ T1000] WARNING: CPU: 0 PID: 1000 at mm/page_alloc.c:4738 __alloc_pages_nodemask+0x2f3/0x740 [ 357.850273][ T1000] Modules linked in: netdevsim veth openvswitch nsh nf_conncount nf_nat nf_conntrack nf_defrx [ 357.852989][ T1000] CPU: 0 PID: 1000 Comm: bash Tainted: G B 5.5.0-rc5+ #270 [ 357.854334][ T1000] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 357.855703][ T1000] RIP: 0010:__alloc_pages_nodemask+0x2f3/0x740 [ 357.856669][ T1000] Code: 64 fe ff ff 65 48 8b 04 25 c0 0f 02 00 48 05 f0 12 00 00 41 be 01 00 00 00 49 89 47 0 [ 357.860272][ T1000] RSP: 0018:ffff8880b7f47bd8 EFLAGS: 00010246 [ 357.861009][ T1000] RAX: ffffed1016fe8f80 RBX: 1ffff11016fe8fae RCX: 0000000000000000 [ 357.861843][ T1000] RDX: 0000000000000000 RSI: 0000000000000017 RDI: 0000000000000000 [ 357.862661][ T1000] RBP: 0000000000040dc0 R08: 1ffff11016fe8f67 R09: dffffc0000000000 [ 357.863509][ T1000] R10: ffff8880b7f47d68 R11: fffffbfff2798180 R12: 1ffff11016fe8f80 [ 357.864355][ T1000] R13: 0000000000000017 R14: 0000000000000017 R15: ffff8880c2038d68 [ 357.865178][ T1000] FS: 00007fd9a5b8c740(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000 [ 357.866248][ T1000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 357.867531][ T1000] CR2: 000055ce01ba8100 CR3: 00000000b7dbe005 CR4: 00000000000606f0 [ 357.868972][ T1000] Call Trace: [ 357.869423][ T1000] ? lock_contended+0xcd0/0xcd0 [ 357.870001][ T1000] ? __alloc_pages_slowpath+0x21d0/0x21d0 [ 357.870673][ T1000] ? _kstrtoull+0x76/0x160 [ 357.871148][ T1000] ? alloc_pages_current+0xc1/0x1a0 [ 357.871704][ T1000] kmalloc_order+0x22/0x80 [ 357.872184][ T1000] kmalloc_order_trace+0x1d/0x140 [ 357.872733][ T1000] __kmalloc+0x302/0x3a0 [ 357.873204][ T1000] nsim_bus_dev_numvfs_store+0x1ab/0x260 [netdevsim] [ 357.873919][ T1000] ? kernfs_get_active+0x12c/0x180 [ 357.874459][ T1000] ? new_device_store+0x450/0x450 [netdevsim] [ 357.875111][ T1000] ? kernfs_get_parent+0x70/0x70 [ 357.875632][ T1000] ? sysfs_file_ops+0x160/0x160 [ 357.876152][ T1000] kernfs_fop_write+0x276/0x410 [ 357.876680][ T1000] ? __sb_start_write+0x1ba/0x2e0 [ 357.877225][ T1000] vfs_write+0x197/0x4a0 [ 357.877671][ T1000] ksys_write+0x141/0x1d0 [ ... ] Reviewed-by: Jakub Kicinski <kuba@kernel.org> Fixes: `7957922056` ("netdevsim: add SR-IOV functionality") Fixes: `82c93a87bf` ("netdevsim: implement couple of testing devlink health reporters") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2020-02-14 16:53:00 -05:00
arch	x86/boot: Handle malformed SRAT tables during early ACPI parsing	2020-02-14 16:52:59 -05:00
block	compat: scsi: sg: fix v3 compat read/write interface	2020-02-11 04:37:17 -08:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	crypto: api - Fix race condition in crypto_spawn_alg	2020-02-11 04:37:01 -08:00
Documentation	PM / devfreq: Add new name attribute for sysfs	2020-02-04 18:18:01 +00:00
drivers	netdevsim: use __GFP_NOWARN to avoid memalloc warning	2020-02-14 16:53:00 -05:00
fs	NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals	2020-02-14 16:52:59 -05:00
include	RDMA/uverbs: Verify MR access flags	2020-02-14 16:52:56 -05:00
init	Revert "um: Enable CONFIG_CONSTRUCTORS"	2020-02-01 09:33:00 +00:00
ipc	ipc/msg.c: consolidate all xxxctl_down() functions	2020-02-11 04:36:39 -08:00
kernel	perf/cgroups: Install cgroup events to correct cpuctx	2020-02-11 04:37:28 -08:00
lib	lib/test_kasan.c: fix memory leak in kmalloc_oob_krealloc_more()	2020-02-11 04:36:45 -08:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush	2020-02-11 04:37:14 -08:00
net	bpf, sockmap: Check update requirements after locking	2020-02-14 16:53:00 -05:00
samples	samples/bpf: Reintroduce missed build targets	2020-02-11 04:37:00 -08:00
scripts	scripts/find-unused-docs: Fix massive false positives	2020-02-11 04:36:53 -08:00
security	broken ping to ipv6 linklocal addresses on debian buster	2020-02-11 04:37:16 -08:00
sound	ASoC: Intel: skl_hda_dsp_common: Fix global-out-of-bounds bug	2020-02-11 04:37:21 -08:00
tools	selftests/bpf: Test freeing sockmap/sockhash with a socket in it	2020-02-14 16:52:59 -05:00
usr	gen_initramfs_list.sh: fix 'bad variable name' error	2020-01-04 00:00:48 +09:00
virt	KVM: Play nice with read-only memslots when querying host page size	2020-02-11 04:37:29 -08:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	MAINTAINERS: update my email address	2020-01-11 14:33:39 -08:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Linux 5.4-rc4	2019-10-29 04:43:29 -06:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	MAINTAINERS: correct entries for ISDN/mISDN section	2020-02-11 04:36:38 -08:00
Makefile	Linux 5.5.3	2020-02-11 04:37:31 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.